Inner right angle corner forming unit for a concrete wall form



J1me 1957 B. HILLBERG 2,794,235

, INNER RIGHT ANGLE CORNER FORMING UNIT FOR A CONCRETE WALL FORM FiledMay. 5, 1955 2 Sheets-Sheet 1 B. HILLBERG INNER RIGHT ANGLE CORNERFORMING UNIT June 4, 1957 FOR A CONCRETE WALL FORM 2 Sheets-Sheet 2 vFiled May 3, 1955 United States Patent INNER RIGHT ANGLE CORNER FOG UNITFOR A CONCRETE WALL FORM Bror Hillberg, Chicago, Ill., assignor toSuperior Concrete Accessories, Inc., Chicago, 111., a corporation ofIllinois Application May 3, 1955, Serial No. 505,713

4 Claims. (Cl. 25-131 The present invention relates generally to wallforms. More particularly, the invention relates to that type of wallform which is designed for use in the formation of a concrete wall andcomprises: (1) a series of upstanding edge to edge rectangular panelswhich are formed of plywood or other suitable material and haveoppositely disposed hole forming notches in the abutting side edgesthereof; (2) a second series of similar upstanding rectangular panelswhich are disposed in opposed but spaced apart relation with the panelsof the first series; (3) horizontally positioned combined tie andspreader rods which extend between and at right angles to the two seriesof panels and have the ends thereof projecting through and beyond thenotch-formed holes between the abutting side edges of the panels; and(4) removable clamping devices which are associated with the ends of thecombined tie and spreader rods and serve when in place to hold thepanels in fixed relation with the ends of the rods.

In connection with the use of a concrete wall form of the aforementionedtype it is necessary when the wall to be formed is to have a right anglebend to arrange certain of the panels of one series at right angles withrespect to the other panels of the one series and correspondingly toarrange the panels of the other series. Heretofore, difliculty has beenexperienced in positioning and connecting together the two panels thatserve to form the inside corner of the right angle bend in the concretewall that is formed by use of the form.

One object of this invention is to provide in connection with a concretewall form of the type under consideration an inside right angle cornerforming unit which involves a simple and novel construction, effectivelyand efficiently fulfills its intended purpose, and is so designed thatit may be assembled and dismantled with facility. In general, theimproved unit comprises: (1) a pair of vertically elongated rectangularupstanding panels'which are positioned at right angles to one anotherand so that their inner side edges are disposed a small distance apart;(2) an upstanding angle bar which is the same in height as the twopanels, fits in the space between the inner side edges of the panels,and is arranged so that the outer surfaces of its side flanges are incoplanar relation with the inner faces of the panels respectively; and(3) releasable means for holding the angle bar and the two panels infixedly connected relation.

Another object of the invention is to provide an inside right anglecorner forming unit of the aforementioned character in which the twopanels are provided on their outer faces thereof with vertically spacedhorizontally disposed reenforcing boards which are arranged so that theinner end edges thereof are disposed adjacent to, but spaced a smalldistance inwards of, the inner side edges of the panels and have mountedon their outer surfaces longitudinally extending metallic strips theinner ends of which project beyond the inner end edges of the boards andare bent inwards at substantially right angles in order to form adjacentto the inner side edges of the panels yertically extending open endedsockets; in which the upstanding angle bar is provided with verticallyspaced horizontally extending plates which are welded to the innersurfaces of the side flanges of the angle bar, are positioned adjacentto the inwardly bent ends of the metallic strips on the reenforcingboards and have the outer corner portions thereof provided with holes inalignment with the aforementioned sockets; and in which the releasablemeans for fixedly connecting together the angle bar and the two panelsare in the form of vertically extending downwardly tapered pins whichextend downwards through the sockets and the holes.

Another object of the invention is to provide an inside right anglecorner forming unit of the type and character under consideration inwhich the inwardly bent inner ends of the metallic strips on thereenforcing boards have horizontal notches therein and the verticallyspaced horizontally extending plates on the angle bar are arranged sothat the hole-equipped outer corner portions thereof fit within theaforesaid notches.

Another object of the invention is to provide an inside right anglecorner forming unit of the character under consideration in which theside portions of the vertically spaced horizontally extending plates onthe angle bar have formed therein right angle cutouts for accommodatingand snugly receiving the adjacent corner portions of the panels.

A further object of the invention is to provide an inside right anglecorner forming unit of the character heretofore mentioned in which thepins for fixedly connecting together the angle bar and the panels areconnected to the angle bar by flexible elements in order that they maybe readily manipulated into and out of their operative position while atthe same time they are not capable of being lost in connection withtransportation of the unit as a whole.

A still further object of the invention is to provide an inside rightangle corner forming unit which is generally of new and improvedconstruction and is characterized by such simplicity of design that itmay be produced at a comparatively low cost.

Other objects of the invention and the various advantages andcharacteristics of the present inside right angle corner forming unitwill be apparent from a consideration of the following detaileddescription.

The invention consists in the several novel features which arehereinafter set forth and are more particularly defined by the claims atthe conclusion hereof.

In the drawings which accompany and form a part of this specification ordisclosure and in which like numerals of reference denote correspondingparts throughout the several views:

Figure l is a fragmentary perspective view of an inside right anglecorner forming unit embodying the invention;

Figure 2 is a fragmentary perspective view of the angle bar of the unit;

Figure 3 is an enlarged fragmentary horizontal section of the unit,illustrating in detail the manner in which the vertically extendingdownwardy tapered pins serve fixedly to connect together the angle barand the two panels and showing one of the panels in connected relationwith an adjacent wall forming panel;

Figure 4 is a perspective view of one of the vertically spacedhorizontally extending plates which are welded to the inner surfaces ofthe side flanges of the angle bar of the unit; and

Figure 5 is a side or edge view of the plate that is shown in Figure 4.

The inside right angle corner forming unit which is shown in thedrawings constitutes the preferred form or embodiment of the invention.It is adapted to provide a part of a form for use in connection with theformation of a concrete wall having a right angle bend therein, and asits principal parts or components comprises a pair of upstandingvertically elongated rectangular panels 6 and an upstanding angle bar 7.It is contemplated that the unit will form the apex of a right angleseries of edge to edge panels for forming the inner side of a concretewall with a right angle bend and that such series will be in opposed butspaced apart relation with a similar series of edge to edge panels forforming the outer side of the wall.

The panels 6 of the unit are preferably formed of plywood and have flatinner and outer faces. They are arranged normally so that they extend atright angles to one another and have the inner side edges thereof spaceda small distance apart. The outer side edges of the panels 6 areprovided at vertically spaced locations with semi-circular notches 8through which certain ends of horizontally positioned combined tie andspreader rods 9 are adapted to extend as shown in Figure 3 of thedrawings. The panels 6 are reenforced by horizontally disposed boards 10which extend across the outer faces of the panels and are secured inplace by nails 11 or similar attaching devices. The boards 10 arepreferably positioned so that the imaginary longitudinal center linesthereof are in alignment with the semi-circular notches 8 in the outerside edges of the panels. As shown in the drawings the end edges of thereenforcing boards 10 are disposed a small distance inwards of the sideedges of the panels. The boards are provided on the outer surfacesthereof with horizontally extending metallic strips 12. Such strips arelocated midway between the upper and lower edges of the reenforeingboards and are fixedly secured in place by way of screws 13. The innerends of the strips 12 project beyond the inner end edges of thereenforcing boards and are bent inwards at substantially right angles,thus providing a hook portion 12a which, in combination with the innerend edges of the reinforcing boards, provide elongated verticallyextending open ended sockets 14. The outer ends of the strips 12 projectbeyond the outer end edges of the reenforcing boards and are bentinwards at substantially right angles so as to form elongated verticallyextending open ended sockets 15 adjacent to the semi-circular notches 8.The inner ends of the strips 12 are provided with horizontal notches 16and the outer ends of the strips are provided with horizontal notches 17for receiving the adjacent projecting ends of the combined tie andspreader rods 9.

The angle bar 7 of the inside right angle corner forming unit is thesame in height as the panels 6. It is of one-piece character andconsists of a pair of side flanges 18. The latter are flat and extend atright angles to one another. The angle bar 7 is disposed in the spacebetween the inner side edges of the panels 6 and is arranged so that theouter surfaces of its side flanges are in coplanar relation with theinner faces of the panels respectively. As shown in Figure 3 the outerside edges of the side flanges of the angle bar abut against the innerside edges of the panels. The angle bar is provided with verticallyspaced horizontally extending metallic plates 19. The latter aredisposed between the side flanges 18 and are arranged so that they arein horizontal alignment with the inner ends of the metallic strips 12.The inner corner portions of the plates are connected by welds 20 to theadjacent portions of the inner surfaces of the side flanges 18. The sideportions of the plates are provided with right angle cutouts 21 whichaccommodate and snugly receive the adjacent corner portions of thepanels 6. The outer corner portions of the plates 19 extend through thenotches 16 into the vertically extending open ended sockets 14 and areprovided with vertically extending holes 22 which as best shown inFigure 3 are in registry or alignment with such sockets and arepositioned adja cent to the right angle bends of the inner ends of themetallic strips 12.

In addition to the parts heretofore described the unit comprisesreleasable means for fixedly connecting together the angle bar 7 and thepanels 6. Such means comprises a plurality of normally verticallyextending, downwardly tapered pins 23. The latter correspond in numberto the holes 22 in the outer corner portions of the plates 19 and areadapted in connection with use thereof to be driven downwards throughthe sockets 16 and the holes 22 as shown in Figure 1. When the pins 23are in place certain side portions thereof engage with a wedging actionthe right angle bends of the inner ends of the metallic strips 12 andresult in the panel corner portions that are adjacent to the angle barbeing drawn into firmly seated relation with the right angle cutouts 21in the side portions of the plates 19. The pins 23 are provided at theupper ends thereof with beads 24 and are connected to the side flanges18 of the angle bar by way of chains 25 or other flexible elements.Certain ends of the chains are suitably connected to the heads 24 andthe other ends of the chains are connected to eye-bolts 26. The latterare preferably located above the plates 19 and have the shanks thereofwelded to, or screwed into holes in, the side flanges 18 of the anglebar 7. The chains 25 serve to prevent the pins 23 from being misplacedfrom the angle bar and hence in connection with transportation of theunit the pins are not likely to become lost and will be available at thelocation where the unit is to be installed or used.

The inside right angle corner forming unit is assembled by first placingthe angle bar 7 in an upstanding or vertical position on a suitablefoundation. Thereafter the panels 6 are manipulated into juxtapositionwith respect to the angle bar and so that they extend at right angles toone another. After so positioning the panels the latter are shiftedlaterally towards the angle bar in order to bring the inner cornerportions thereof into seated relation with the right angle cutouts inthe side portions of the plates 19. In connection with inward lateralshift of the panels the outer corner portions of the plates slide intothe sockets 14 via the horizontal notches 16 in the inwardly bent innerends of the metallic strips 12. After the panels 6 are properlypositioned with respect to the angle bar 7 the pins 23 are drivendownwards so that they extend through the sockets 14 and the holes 22.As soon as the pins are driven fully into place, they serve fixedly toconnect together the angle bar 7 and the panels 6. When it is desired todismantle the unit after a wall forming operation, the pins 23 aredriven upwards until they are removed from the sockets 14 and the holes22. After removal of the pins from their operative position, the panelsare free and hence may lge removed by sliding them laterally away fromthe angle In connection with use of the unit, it is contemplated thatwall forming panels like those disclosed in my copending United Statespatent application Serial No. 500,107, filed on April 8, 1955 andentitled Concrete Wall Form will be placed in edge to edge relation withthe panels 6 of the unit and clamped in place by way of releasableclamping devices like that shown in Figure 3 of the drawings anddesignated by the reference numeral 27. Such devices comprise brackets28 and U-shaped locking bolts 29. The brackets are horizontallyelongated, extend at right angles to the panels and embody at theirinner ends pairs of spaced apart depending fingers certain of which areadapted to fit in the sockets 15 that are formed by the inwardly bentouter ends of the metallic strips 12. The U-shaped locking bolts 29 ofthe removable clamping devices 27 are slidably mounted on the inner endsof the brackets 28 and are adapted when driven into the direction oftheir open ends to be brought into straddled relation with heads 30 onthe extremities of the combined tie and spreader rods 9. For a moredetailed description of the construction, arrangement and mode ofoperation of the combined tie and spreader rods 9 and the removableclamping devices 27 reference may be had to my aforesaid copendingUnited States patent application Serial No. 500,107.

The herein described inside right angle corner forming unit due to itsparticular design or construction effectively and efliciently fulfillsits intended purpose and is char-.

acterized by the fact that it may be installed and removed with facilityand also produced or fabricated at a comparatively low cost.

The invention is not to be understood to be restricted to the detailsset forth since they may be modified within the scope of the appendedclaims without departing from the spirit and scope of the invention.

Having thus described the invention what I claim as new and desire tosecure by Letters Patent is:

1. As a new article of manufacture, an inside right angle corner formingunit adapted to constitute a part of a form for use in the formation ofa concrete wall with a right angle bend therein and comprising a pair ofside by side upstanding panels positioned at right angles to one anotherand so that their inner side edges are spaced a small distance apart,vertically spaced horizontally disposed reenforcing boards extendingacross, and secured to, the outer faces of the panels and arranged sothat they are in horizontally aligned pairs and have the inner end edgesthereof disposed a small distance inwards of the inner side edges of thepanels, metallic strips extending lengthwise of, and connected to, theouter faces of the boards and having the inner ends thereof projectingbeyond the inner end edges of the boards and bent inwards so as to form,in combination with said inner edges of the boards, vertically extendingsockets, an upstanding angle bar consisting of right angle side flanges,positioned in the space between the inner side edges of the panels,arranged so that the outer surfaces of its side flanges aresubstantially in coplanar relation with the inner faces of the panelsrespectively, and having disposed between, and fixedly connected to, theinner surfaces of its side flanges vertically spaced horizontallyextending plates corresponding in number to, and respectivelyhorizontally aligned with, the pairs of sockets and having the outercorner portions thereof provided with holes in substantial verticalalignment with the sockets, and means operative releasably to connecttogether the angle bar and the panels and consisting of verticallypositioned pins extending through said sockets and holes, said pins,when positioned in said holes, exerting a wedging action on the inwardlybent ends of said metallic strips tending to draw the panels against theside flanges of said angle bar.

2. As a new article of manufacture an inside right angle corner formingunit adapted to constitute a part of a form for use in the formation ofa concrete wall with a right angle bend therein and comprising a pair ofside by side upstanding panels positioned at right angles to one anotherand so that their inner side edges are spaced a small distance apart,horizontally disposed reenforcing boards extending across, and securedto, the outer faces of the panels and arranged in horizontally alignedpairs and so that the inner end edges thereof are disposed a smalldistance inwards of the inner side edges of the panels, metallic stripsextending lengthwise of, and connected to, the outer surfaces of theboards and having the inner ends thereof projecting beyond the inner endedges of the boards, bent inwards so as to form, in combination with theinner edges of the boards, vertically extending sockets, and providedwith longitudinal notches, an upstanding angle bar of substantially thesame height as the panels, consisting of right angle side flanges,positioned in the space between the inner side edges of the panels,arranged so that the outer surfaces of its side flanges are in coplanarrelation with the inner faces of the panels respectively, and havingdisposed between, and fixedly connected to, the inner surfaces of itsside flanges vertically spaced horizontally extending platescorresponding in number to, and respectively horizontally with, thepairs of metallic strips and having the outer corner portions thereofextending through the aforesaid notches and provided with holes insubstantial vertical alignment with the sockets, and means operativereleasably to connect together the angle bar and panels and consistingof vertically positioned pins extending through said sockets and holes,said pins, when positioned in said holes, exerting a wedging action onthe inwardly bent ends of said metallic strips tending to draw thepanels against the side flanges of the angle bar.

3. As a new article of manufacture, an inside right angle corner formingunit adapted to constitute part of a form for use in the formation of aconcrete wall with a right angle bend therein and comprising a pair ofside by side similar upstanding panels positioned at right angles to oneanother and so that their inner side edges are spaced a small distanceapart, horizontally disposed. reenforcing boards extending across, andsecured to, the outer faces of the panels and arranged so that they arein horizontally aligned pairs and have the inner end edges thereofspaced a small distance inwards of the inner side edges of the panels,metallic strips extending lengthwise of, and connected to, the outersurfaces of the boards and having the inner ends thereof projectingbeyond the inner end edges of the boards, bent inwards at substantiallyright angles so as to form, in combination with the inner edges of theboards, oppositely disposed pairs of vertically extending sockets, andprovided with longitudinal notches, an upstanding metallic angle bar ofthe same height as the panels, consisting of right angle side flanges,positioned in the space between the inner side edges of the panels,arranged sothat the outer surfaces of its side flanges are substantiallyin coplanar relation with the inner faces of the panels respectively,and having disposed between, and welded to, the inner surfaces of itsside flanges vertically spaced horizontally extending metallic platescorresponding in number to, and respectively horizontally aligned with,the pairs of sockets, having the outer corners thereof extending throughthe notches and provided with holes in vertical alignment with thesockets, and having in their side portions right angle cutouts in whichthe adjacent corner portions of the panels fit snugly, and meansoperative releasably to connect together the angle bars and the panelsand consisting of vertically positioned tapered pins extending throughsaid sockets and holes, and exerting a wedging action on the inwardlybent ends of said metallic strips tending to draw the panels against theside flanges of said angle bar.

4. As a new article of manufacture, an inside right angle corner formingunit adapted to constitute part of a form for use in the formation of aconcrete wall with a right angle bend therein and comprising a pair ofside by side upstanding panels positioned at right angles to one anotherand so that their inner side edges are spaced a small distance apart,horizontally disposed reinforcing boards of substantial vertical widthextending longitudinally across, and secured to, the outer faces of thepanels and arranged so that they are in horizontally aligned pairs andhave the inner end edges thereof disposed at small distance inwards ofthe inner side edges of the panels, metallic strips extending lengthwiseof, and connected to, the outer surfaces of the boards medially of theirupper and lower edges and having their inner ends bifurcated with thebifurcations thereof projecting beyond the inner edges of the boards andturned laterally to provide a pair of hook portions which are spacedapart in a vertical direction, an upstanding metallic angle bar of thesame height as that of the panels and consisting of right angle sideflanges positioned in the space between the inner side edges of thepanels with the outer surfaces of said side flanges disposedsubstantially in coplanar relation with the inner faces of the panelsrespectively, horizontally extending metallic plates disposed betweenand welded to the inner surfaces of said side flanges, said platescorresponding in number to and being respectively aligned with thebifurcated inner ends of said metallic strips, said plates being formedwith right angle cutouts in which the adjacent corner portions at theinner edges of the panels snugly fit, the free outer end regions of saidplates being closely straddled by the bifurcations at the inner ends ofsaid metallic strips so that the hook portions overlie and underlie theplates respectively, there being a hole formed in each plate insubstantial vertical alignment with each pair of spaced hook portions,and a tapered pin projecting through each hole and exerting a wedgingaction on at least the upper hook portion of each spaced pair thereoftending to draw the panels against the side flanges of said angle bar.

References Cited in the tile of this patent UNITED STATES PATENTS Daviset al. Sept. 6, 1910 Carpenter Apr. 5, 1921 Creedon May 18, 1926Baumberger Sept. 7, 1926 Stevens Mar. 22, 1927 FOREIGN PATENTS AustraliaSept. 4, 1941

